feat: enable clockSkew correction by default

[trivikr]

Issue #, if available:
N/A

Description of changes:
Enables clockSkew correction by default

In v2:

• The applyClockOffset is called in name HTTP_HEADERS with eventName httpHeaders (code)
• The code which adds listeners from AWS.EventListeners.Core (and others) to request (code)
• The function which calls httpHeaders callback (code)
• The callback is passed to handleRequest in executeSend (code)

How signing works in v3:

• SignatureV4 sign method uses current Date for signing if one is not passed in options (code)
• signing happens in signRequest/signString (code)
• signing-middleware calls signer.sign passing request and no options (code)

In v3 smithy-codegen branch:

• AwsAuthPlugin does the functionality of signing (code)
• The auth plugin calls the signingMiddleware (code)
• signer.sign operation is called in middleware (code)

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

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Codecov Report

Merging #459 into smithy-codegen will increase coverage by 0.03%.
The diff coverage is 100%.

@@                Coverage Diff                 @@
##           smithy-codegen     #459      +/-   ##
==================================================
+ Coverage           95.13%   95.17%   +0.03%     
==================================================
  Files                  72       72              
  Lines                1378     1389      +11     
  Branches              269      272       +3     
==================================================
+ Hits                 1311     1322      +11     
  Misses                 67       67

Impacted Files	Coverage Δ
packages/middleware-signing/src/middleware.ts	85.71% <100%> (+9.24%)	⬆️

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[AllanZhengYP]

Looks good to me. Just have one minor comment.

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